HELP...!! JAVA GUI SWING... and make TIMER...

help this is our assignment...!!

we should make a GUI based program
so there's a PASSWORD in random
using letter A till Z
,,, we make it already with 10 length for the words

then prepare the FIELD for entering the password
if the user WRONG in 3 times entered...
so THERE WOULD BE a COUNTDOWN

waiting only 1 minute... then the USER can enter again...
,,,, how to make this...?

i understand to make COUNTER if the counter become 3 so the TIMER works... but how to make it... ??? pLZZZ

help me out of this probs...!!